--_J.A. Hall, on Construction and Maintenance
of Track, before American Society of Civil Engineers._
* * * * *
THE EXPERIMENTS AT THE ANNAPOLIS PROVING GROUNDS.
The desperate war that has been waging between the gun and armor
plate, ever since the period when protective plates were first applied
to naval constructions, is familiar to all. In this conflict the
advantage seems to lean toward the side of the gun, the power of
penetration of which can be increased to almost indefinite limits, at
least theoretically, while we quickly reach the extreme thicknesses of
metal that can be practically employed for the protection of ships.
So, in recent times, researches have been making upon the efficacy of
armor plating, no longer in its exaggeration of thickness, but in the
intrinsic quality of the metal of which it is composed. Metallurgists
have applied themselves to the work and have thus brought out various
products, among which the plates called "compound," of Messrs. Cammell
& Co., have obtained a great notoriety. These plates, formed of a true
plating of steel upon a bed of soft iron, have been much in vogue in
the English navy, and seemed as if they were to be adopted about
everywhere.
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